Traditionally, certain foods such as chocolate, peanuts, fatty foodstuffs, and dairy products have been blamed for causing or aggravating acne. Research studies, however, have failed to find any association between certain diets and acne. This conclusion is now widely accepted amongst dermatologists.
However, a few dietary recommendations may be given for acne patients.

Sensitivity to Particular Foods:

Despite the fact that, for most patients, there is not any association between dietary factors and acne, there are exceptional cases where a certain food does cause acne to appear within days of its ingestion.
If there is an apparent correlation between consumption of that food and acne, the patient should avoid that specific food.

Milk Products and Acne

An acne patient undergoing treatment with antibiotics of the tetracycline group should avoid milk products while taking these drugs.
After ingestion of milk products, one should wait at least two hours before taking these antibiotics.
For acne patients who are not taking tetracyclines, there is no special reason to avoid milk products.

Alternative Medical Treatments Associated with Diet:

In the standard medical literature, there is no proof that alternative therapies are effective in acne. Nevertheless, these forms of treatment are usually harmless.
Therefore, if an acne sufferer is interested in alternative therapies (whether or not they involve dietary changes), they can be tried, provided there is no possibility that they will harm his/her health.
In any case, these therapies should be used in conjunction with conventional medical acne treatment.
Nowadays it is quite rare for acne not to improve with conventional medical treatment, taking into account the wide range of treatments currently available.